-4(r-1)=40

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Solution for -4(r-1)=40 equation: 


Simplifying
-4(r + -1) = 40

Reorder the terms:
-4(-1 + r) = 40
(-1 * -4 + r * -4) = 40
(4 + -4r) = 40

Solving
4 + -4r = 40

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '-4' to each side of the equation.
4 + -4 + -4r = 40 + -4

Combine like terms: 4 + -4 = 0
0 + -4r = 40 + -4
-4r = 40 + -4

Combine like terms: 40 + -4 = 36
-4r = 36

Divide each side by '-4'.
r = -9

Simplifying
r = -9

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